When mounting a file using the loopback device, the mount program hangs
for ever. Other than that, the system is still usable.
Dist: Redhat-7
Kernel: 2.4.2 (compiled with kgcc, i.e. egcs-2.91.66)
CPU: Pentium II 400
Mem: 128MB RAM + 512MB swap
(More information below)
For me, it is 100% reproducable, no matter what I try to mount:
1. an ISO image from a Win2000 FAT32 partition, from hdb
(IDE/ATAPI drive)
2. an ext2 image from an ext2 partition, from hdb (IDE/ATAPI
drive)
3. an ext2 image from a Win2000 FAT32 partition, from hda
(a different IDE/ATAPI drive)
The simplest way for me to reproduce it is:
dd if=/dev/zero of=t bs=1024k count=1
mke2fs t
mount -o loop t /mnt/cdrom
Mount then hangs, and never recovers. I cannot even kill it using
kill -9.
An strace of mount shows (they all die in the exact same place):
[...]
open("t", O_RDWR) = 3
open("/dev/loop0", O_RDWR) = 4
mlockall(0x3, 0xbffff848) = 0
ioctl(4, LOOP_SET_FD, 0x3) = 0
ioctl(4, LOOP_SET_STATUS, 0xbffff828) = 0
close(4) = 0
close(3) = 0
rt_sigprocmask(SIG_BLOCK, ~[TRAP SEGV], NULL, 8) = 0
stat64("/dev/loop0", {st_mode=S_IFBLK|0660, st_rdev=makedev(7,
0), ...}) = 0
open("/dev/loop0", O_RDONLY) = 3
lseek(3, 1024, SEEK_SET) = 1024
read(3,
(The last line is left unfinished by strace.)
ps auwx shows:
[...]
root 818 0.0 1.2 1564 1548 pts/0 DL 08:44 0:00 mount -o
loop t /mnt/cdrom
[...]
I have lots of memory available; free shows:
total used free shared buffers cached
Mem: 127156 124884 2272 0 19140 49148
-/+ buffers/cache: 56596 70560
Swap: 530104 60 530044
Other than that, the system is still fine. I can umount and mount
other, real block devices (attempting to mount another loopback just
causes another process to hang).
I can't keep up with the kernel traffic. If you need any more
information, please e-mail me directly.
Thanks,
Steven
--------
/proc/version:
Linux version 2.4.2 (root@minneyar) (gcc version egcs-2.91.66
19990314/Linux (egcs-1.1.2 release)) #5 Fri Mar 2 08:09:35 CST 2001
/proc/cpuinfo:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 5
model name : Pentium II (Deschutes)
stepping : 3
cpu MHz : 399.327
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
cmov pat pse36 mmx fxsr
bogomips : 796.26
/proc/modules:
loop 7584 2 (autoclean)
tdfx 53104 1
nfsd 70992 8 (autoclean)
lockd 49744 1 (autoclean) [nfsd]
sunrpc 59136 1 (autoclean) [nfsd lockd]
8139too 15104 1 (autoclean)
agpgart 13952 1
nls_iso8859-1 2832 2 (autoclean)
nls_cp437 4352 2 (autoclean)
vfat 11504 2 (autoclean)
fat 31744 0 (autoclean) [vfat]
es1371 26832 0
soundcore 3856 4 [es1371]
ac97_codec 7920 0 [es1371]
usb-uhci 22544 0 (unused)
usbcore 47408 1 [usb-uhci]
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